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 What are discrete spheres? ÁõÊÀÆ½ ½ÌÊÚ(ÖÐ¿Æ´ó) Wednesday, November 14th, 2018, 12:30 PM  ãÉÐÐ4½Ì414 Abstract: The Bonnet-Myers theorem states that an n-dimensional complete Riemannian manifold M with Ricci curvature lower bounded by a positive number (n-1)K is compact, and its diameter is no greater than $\pi/\sqrt{K}$. Moreover, Cheng's rigidity theorem tells that the diameter estimate is sharp if and only if M is the n-dimensional round sphere. In this talk, I will discuss discrete analogues of round spheres in graph theory via exploring discrete Bonnet-Myers-Cheng type results. This talk is based on joint works with Cushing, Kamtue, Koolen, Muench, and Peyerimhoff.

 Links >> East China Normal University Center for PDE Center for Operator Algebras

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